Was Linda right to make Mickey stop taking the pills?

Towards the end of the play Sammy shoots a petrol attendant, this leads to Mickey and Sammy going to jail. Mickey gets very depressed by this and has to take pills to help him.
When he gets home to Linda she tries to convince him to stop taking the pills and, eventually, Mickey gives in to her.
Later in the play, because Mickey has stopped taking the pills, he shoots and kills Edward with the gun the Sammy also killed with.
Do you think this is Linda's fault or is anyone else to blame for this terrible accident?